scholarly journals Experimental research of sliding surface distributed nanosecond discharge in supersonic air flow

2014 ◽  
Vol 516 ◽  
pp. 012021 ◽  
Author(s):  
I Belysheva ◽  
I Mursenkova ◽  
A Chvyreva
Keyword(s):  
Experimental Research ◽  
Air Flow ◽  
Nanosecond Discharge ◽  
Sliding Surface

scholarly journals Experimental Research of Gaseous Emissions Impact on the Performance of New-Design Cylindrical Multi-Channel Cyclone with Adjustable Half-Rings

2022 ◽  
Vol 14 (2) ◽  
pp. 902
Author(s):  
Aleksandras Chlebnikovas ◽  
Dainius Paliulis ◽  
Kristina Kilikevičienė ◽  
Artūras Kilikevičius
Keyword(s):  
Experimental Research ◽  
Gas Flow ◽  
Collection Efficiency ◽  
Fine Particulate Matter ◽  
Air Flow ◽  
Gaseous Emissions ◽  
Channel System ◽  
Flow Parameters ◽  
The Impact ◽  
Channel Type

Cyclones are widely used for separating particles from gas in energy production objects. The efficiency of conventional centrifugal air cleaning devices ranges from 85 to 90%, but the weakness of many cyclones is the low collection efficiency of particles less than 10 μm in diameter. The novelty of this work is the research of the channel-type treatment device, with few levels adapted for precipitation of fine particulate matter, acting by a centrifugal and filtration principle. Many factors have an impact on cyclone efficiency—humidity, temperature, gas (air) composition, airflow velocity and etc. Many scientists evaluated only the effect of origin and size of PM on cyclone efficiency. The effect of gas (air) composition and temperature, and humidity on the multi-channel cyclone-separator efficiency still demands contributions. Complex theoretical and experimental research on air flow parameters and the efficiency of a cylindrical eight-channel system with adjustable half-rings for removing fine-dispersive particles (<20 μm) was carried out. The impact of air humidity and temperature on air flow, and gaseous smoke components on the removal of wood ashes was analyzed. The dusty gas flow was regulated. During the experiment, the average velocity of the cyclone was 16 m/s, and the temperature was 20–50 °C. The current paper presents experimental research results of wood ash removal in an eight-channel cyclone and theoretical methodology for the calculation of airflow parameters and cyclone effectiveness.

A Study of Air-Jet Texturing Nozzles: The Effects of Nozzle Configuration on the Air Flow

1990 ◽  
Vol 112 (1) ◽  
pp. 97-104 ◽  
Author(s):  
A. Demir
Keyword(s):  
Experimental Research ◽  
Air Flow ◽  
Main Duct ◽  
Air Jet ◽  
Nozzle Configuration

A thorough investigation of the existing texturing nozzles will, no doubt, lead to the design of improved nozzles. This paper reports the experimental research carried on the scaled-up versions of the T100 HemaJet with varying geometrical configurations, being the exit shape, situation, and inclination of the inlet holes, and the ratio of the incoming holes area to the nozzle’s main duct area. It has been found that the exit shape has virtually no effect on the airflow whilst other parameters contribute to the formation of the emerging jet which performs the texturing.

The Rationalization of Parameters of the Sucion Intake Device for Packed Bulk Construcion Materials

2014 ◽  
Vol 1020 ◽  
pp. 385-390
Author(s):  
S.A. Evtyukov ◽  
A.A. Schimanova ◽  
Jarosław Rajczyk ◽  
Marlena Rajczyk
Keyword(s):  
Incomplete Information ◽  
Experimental Research ◽  
Building Materials ◽  
Air Flow ◽  
Pneumatic Transport ◽  
Compressed Air ◽  
Optimal Parameters ◽  
Effective Operation ◽  
Sufficient Degree

Pneumatic transport is one of the most progressive means of mechanization and automation of loose goods transportation. It is used in aluminium, chemical, food, textile, construction and other industries. However, wide use of pneumatic transport is limited by the incomplete information on this subject. In this article provides a description of the design of useful models of the suction intake device пневмотранспортной installation. A useful model was developed with the participation of the author of the staff of the Department of transport and technological machines architectural-building University. The author has developed stages of the suction intake unit and carried out theoretical and experimental research on each step to achieve the most effective operation of the device. In view of the fact that for the main parameters of the suction intake devices of the theory of destroying the fabric of a flooded the air flow is not developed to a sufficient degree, the author has studied the process of propagation and interaction of flooded jet with the surface. The article systematized and presents the results of experimental research on the interaction of flooded jets of air sealing with building materials of different kinds. The author determined the optimal parameters of the process of packed loosening material jets of compressed air at the fence material suction fence device.

scholarly journals Experimental Investigation of Water Droplet Phase Change in Humidi-fied Air Flow

Mechanika ◽  
2020 ◽  
Vol 26 (3) ◽  
pp. 197-205
Author(s):  
Virginijus RAMANAUSKAS ◽  
Linas PAUKŠTAITIS ◽  
Gintautas MILIAUSKAS ◽  
Egidijus PUIDA
Keyword(s):  
Experimental Investigation ◽  
Phase Change ◽  
Experimental Research ◽  
Water Droplet ◽  
Research Method ◽  
Air Flow ◽  
Equivalent Diameter ◽  
Initial Water ◽  
Humidified Air ◽  
Droplet Phase

An experimental research method and an analysis of the results of a water droplet phase change in the additionally humidified air flow are presented. The diagrams of variation of the equivalent diameter of convectively heated water droplets are presented and analysed. The influence of initial water temperature and additionally humidifying air flow on the phase change of a droplet in transient regime is experimentally substantiated.

JUSTIFICATION THE HOPPER OUTLET FORM, WHICH PROVIDES CONSTANT DISCHARGE OF THE GRAIN

10.12737/3813 ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. 79-83
Author(s):  
Савенков ◽  
Dmitriy Savenkov
Keyword(s):  
Friction Force ◽  
Experimental Research ◽  
Flow Rate ◽  
Industrial Development ◽  
Air Flow ◽  
External Friction ◽  
Constant Flow ◽  
Friction Forces ◽  
Frictional Forces ◽  
Side Walls

The uniformity of air flow in the aspirating channels largely depends on constant supply of grain across the channel. However, most of the feeding aspirators do not provide a constant flow of particulate mater. That’s why one of the areas of industrial development of new technological operations is their preliminary theoretical and experimental research. The uniformity expiration of grain from the hopper to the outlet side occurs through the action of frictional forces. The friction forces are divided into internal and external friction, opposing the grain movement. External friction force, provided by the walls of the hopper, reduce the exhaust velocity of bulk near the walls. Thus, the extensional discharge of the bulk is more in the central parts of the outlet, than in its outer parts. Reducing the extensional discharge in the extreme zones is associated with a decrease in the flow rate of these zones. So that to ensure a constant grain unloading from the hopper, it is proposed to change the outlet profile, enhancing the area of outlet in the areas of its contact with the edges of the side walls. It is shown, that the area of the secondary part depends on the angle of the bottom hopper and the height of the outlet. The results of the data can be used to optimize the geometry of the hopper.

scholarly journals RESEARCH ON THE AERODYNAMIC RESISTANCE OF TRICKLE BIOFILTER / LAŠELINIO BIOFILTRO AERODINAMINIO PASIPRIEŠINIMO TYRIMAI

2011 ◽  
Vol 3 (5) ◽  
pp. 64-69 ◽  
Author(s):  
Alvydas Zagorskis ◽  
Renata Spiečiūtė
Keyword(s):  
Surface Area ◽  
Experimental Research ◽  
Flow Rate ◽  
Air Flow ◽  
Aerodynamic Resistance ◽  
Packing Material ◽  
Large Surface Area ◽  
Air Flow Rate ◽  
First Case ◽  
Artificial Origin

A four – section trickle biofilter was constructed for experimental research. The filter was filled with the packing material of artificial origin. The material consists of plastic balls having a large surface area. The dependence of biofilter aerodynamic resistance on supply air flow rate and the number of filter sections was determined. The aerodynamic resistance of the biofilter was measured in two cases. In the first case, the packing material of the filter was dry, whereas in the second case it was wet. The experimental research determined that an increase in the air flow rate from 0.043 m/s to 0.076 m/s causes an increase in biofilter aerodynamic resistance from 30.5 to 62.5 Pa after measuring four layers of dry packing material. In case of wet packing material, biofilter aerodynamic resistance after measuring four layers of plastic balls increases from 42.1 to 90.4 Pa. Santrauka Eksperimentiniams tyrimams atlikti sukonstruotas keturių sekcijų lašelinis biofiltras. Filtras užpildytas dirbtinės kilmės įkrova, sudaryta iš didelį paviršiaus plotą turinčių plastikinių rutuliukų. Naudojant įkrovą, skirtą introdukuotų mikroorganizmų asociacijoms kultivuoti, nustatytos biofiltro aerodinaminio pasipriešinimo priklausomybės nuo tiekiamo oro srauto greičio ir sekcijų skaičiaus. Biofiltro aerodinaminis pasipriešinimas matuotas dviem atvejais: esant sausai ir sudrėkintai įkrovai. Nustatyta, kad didinant tiekiamo oro srauto greitį nuo 0,043 iki 0,076 m/s, įrenginio aerodinaminis pasipriešinimas išmatavus keturis įkrovos sluoksnius padidėja nuo 30,5 iki 62,5 Pa tuo atveju, kai įkrova sausa, ir nuo 42,1 iki 90,4 Pa, – kai įkrova sudrėkinta.

scholarly journals ANALYSIS OF EXPERIMENTAL RESEARCH ON CYCLONES WITH CYLINDRICAL AND SPIRAL SHELLS / CIKLONŲ SU CILINDRINIU IR SPIRALINIU KORPUSAIS EKSPERIMENTINIŲ TYRIMŲ ANALIZĖ

2012 ◽  
Vol 5 (4) ◽  
pp. 479-486 ◽  
Author(s):  
Aleksandras Chlebnikovas ◽  
Pranas Baltrėnas
Keyword(s):  
Experimental Research ◽  
Dynamic Pressure ◽  
Air Flow ◽  
Solid Particles ◽  
Maximum Efficiency ◽  
Particulate Matters ◽  
Cleaning Efficiency ◽  
Initial Concentration ◽  
Air Cleaning ◽  
Flow Parameters

The conducted investigation is aimed at providing information on air flow parameters in the cylindrical and spiral shell (devices are designed for separating solid particles from air flow having tangent flow inlet). Experimental research has employed multi-cyclones created by the Department of Environmental Protection at Vilnius Gediminas Technical University. The study is focused on investigating and comparing the distribution of the dynamic pressure of the airflow in six-channel cyclones inside the structures of devices. The paper establishes and estimates the efficiency of air cleaning changing air phase parameters using different particulate matters. The efficiency of the cyclone has been defined applying the weighted method based on LAND 28-98/M-08 methodology. The article presents the results of experimental research on the air cleaning efficiency of cylindrical and spiral shells using 20 µm glass and clay particulate matter under the initial concentration that may vary from 500 mg/m3 to 15 g/m3 using semi-rings with windows at different positions. The obtained results has shown that the maximum efficiency of the cylindrical shell increases up to 87,3 % while the initial concentration of glass makes 15 g/m3. Santrauka Nagrinėjami ir tarpusavyje lyginami oro srauto parametrai, jų kitimas ir valymo efektyvumas cilindriniame ir spiraliniame ciklone (įrenginiai skirti kietųjų dalelių iš oro srauto su tangentinio srauto įtekėjimu atskyrimui). Eksperimentinių tyrimų metu naudojami daugiakanaliai ciklonai, sukurti Vilniaus Gedimino technikos universiteto Aplinkos apsaugos katedroje. Tyrimais buvo siekiama išanalizuoti ir palyginti kanalinių ciklonų oro srauto dinaminių slėgių pasiskirstymą įrenginių konstrukcijos viduje, nustatyti ir palyginti oro valymo efektyvumą, kintant oro fazės parametrams, panaudojant skirtingas kietąsias daleles. Ciklonų efektyvumai nustatyti svoriniu metodu, remiantis LAND 28-98/M-08 metodika. Pateikiami cilindrinio ir spiralinio korpusų ciklonų stiklo ir molio 20 µm kietųjų dalelių atskyrimo tyrimų rezultatai, esant įleidžiamai užteršto oro koncentracijai 500 mg/m3 – 15 g/m3, keičiant skirtingos geometrijos kreivalinijinius pusžiedžius. Nustatyta, kad efektyviausiai atskiriamos yra kietosios stiklo dalelės, esant 15 g/m3 pradinei koncentracijai, maksimalus efektyvumas nustatytas cilindriniame ciklone, jis siekia 87,3 %.

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